Die for cutting and punching leather, &amp;c.



PATENTED NOV; 13, 1906.

F. MERTINZ DIE FOR CUTTING AND PUNGHING LEATHER, 8w;

APPLIOA'EION FILED JULY'I, 1906.

. I/VVE/VTOA Franz 1215217702 mw o ATTORNEY? FRANZ MERT'INZ, OF VIENNA,AUSTRIA-HUNGARY.

DIE FOE CUTTING AND PUNCHING LEATHER, 800- Specification of LettersPatent.

Patented Nov. 13, 1906.

Application filed July '7, 1906. Serial No- 325.127.

To all whom it may concern:

Be it known that I, FRANZ MERTINZ, manufacturer, a subject of theEmperor of Austria-Hungary, residing at Vienna, in the Empire ofAustria-Hungary, VII., Schottenfeldgasse 63, have invented new anduseful Improvements in Dies for Cutting and Punching Leather, &c.; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to dies, and especially such dies as may be used tocut out right and left hand Work-pieces for leather goods.

I am Well aware that punching-machines or cuttingpresses are used forcutting or punching out leather goods which are more or less complicatedand, further, that there are devices known which carry a one-edged bladeonly.

The object of my invention is a punching device for right and left handgoods consisting of two-edged blades secured to the circumference of asuitable core in such a manner that the cutting edges protrude over thefaces of the core. By exerting a pressure or a blow upon any point ofthe core an equal action is borne upon the whole length of the cuttingedges, and by merely turning the die right and left hand Work-pieces maybe cut out in immediate succession.

In the drawings a die shaped to be used for cutting out theupper-leather of shoes is represented in Figure l in a plan view, and inFig. 2 in a vertical section along the line a b of Fig. 1. Fig. 3 showsa partially-brokenaWay section of another arrangement of thecutting-blades.

The die consists of a solid core 1, shaped exactly according to thepattern required and preferably made of Wood. To the circumference ofthe core cutting-blades 2, of thin steel, are secured in such a way thatthe cutting edges 3 4 protrude over each of the two opposite faces 5 6of the core. It is advisable to employ watch-spring steel for themanufacture of the cutting-blades, because this steel will adhereclosely to the circumference of the core. If the core has abrupt edges,I prefer to make the cutting-blade of several pieces, which may bejoined together on the edges by suitable angles 7. The division of thecutting-blade into several parts has the further advantage that any partbecoming dull or otherwise injured can be removed separately.

The cutting edges 3 4 for both faces may be both arranged upon oneblade, as shown in Fig. 2. In this case both rows of the fasteningbolts8 take up the pressure exerted upon the cutting edge 3 or 4, whereby theblades are kept secure upon the core; but a separate knife 9 10 may bejust as well arranged for the cutting edge of each face, as shown inFig. 3. In the latter case I prefer to place the knife-backs 11 12 upona protruding strip or a cleat 13 of the core 1, whereby thefastening-bolts 14 15 of each blade are released. These knives may alsobe adj ustably arranged upon the corefor instance, as shown at theright-hand half of Fig. 3. They only need be slotted, the slots 16running in the direction of the height of the core, or several rows ofholes may be arranged in the blade, the latter one being secured by nutsupon immovable screw-bolts. V

In order to prevent the cutting edges to be. driven too deep into theworking-table or punchingboard and to facilitate the removal of theout-out piece from the device or to remove it automatically,concavo-convex rubber disks 17 are secured to both faces 5 6 of the corein such a manner that the disk-rim stands off the face, while the diskcenter is nailed to the face of the core. During the cutting operationthe disks of the downwardly-turned face are compressed and their rimspressed upon the face of the core; but as soon as the punching device islifted they return into their normal position'and press the cut-outpattern off the core, so that the work-piece maybe easily removed orfalls off by itself. The concavo-convex disks are important and usefulin that they secure an ecting effect, not only because of theircompressibility, but also because of their resilience, resulting fromtheir special form. In operation it will be understood that when thedisks are pressed back and then released their tendency is to return bytheir resilience, apart from their compressibility, to normal position,and inso returning they exercise an ejecting effect upon the cutmaterial throughout their circumference, the effect being distinctlydifferent from and superior to the ejection resulting from the return ofrubber after being simply compressed. By means of these disks the deviceis also cheapened, not only as to the disks, which are cheaper thansolid-rubber blocks, but also as to the cutting-blades, for with suchdisks the blades do not have to project as far from the core as theywould if rubber blocks were employed, and consequently can be made ofmuch lighter material.

The faces 5 6 of the core may also be provided with pins 18 or pointedstuds, which serve for making working-marks into the leather during thestamping operation. Such marks are needed to locate, for instance,buttonholes, holes for ears, hooks, or other fastening means, as well asto indicate the connecting-points for different parts which have to beput together.

In using the die it is put upon the material which has to be cut orpunched and a pressure or a blow with a hammer or stamper is exertedupon a part of the upper face of the core. In consequence thereof thecutting edges penetrate equally and simultaneously into the material,cutting out a part corresponding to the shape of the device. By merelyturning the die upon its other face right and left hand cut-outs areobtained in succession, and an equal number of right and left hand Iiecesas are, for instance, re-

uired for s oes-is insured without any furt 'er control.

My invention may not only be applied to the manufacture of shoes orother leather goods, but paper, pasteboard, and similar material mayjust as well beicut or punched with my device, the shape of which may bevaried according to the pattern desired.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a die of the character described, a core, a cutting-knife securedto the circumference of the core and having its cutting edge projectingbeyond the face of the core, and concavo-convex rubber disks secured tothe face of the said core.

2. A die for cutting out right and left hand patterns especially forleather goods, consisting of a solid core provided with two-edged bladesupon its-circumference, each cutting edge protruding over one face ofthe core and concavo-conveX rubber disks arranged upon both faces of thecore, to facilitate the removal of the cut-out piece from the device, asset forth.

A die for the purpose described, consisting of a solid core, carryingone-edged knives adjustably secured upon its circumference in thedirection of the heightof the core, the cutting edges of said knivesreaching over the faces of the core, as set forth.

4. A die for the purpose described, consisting of a solid core carryingone-edged knives adjustably secured upon its circumference inthedirection of the height of the core, the cutting edges of said knivesreaching over the faces of the core, and rubber disks arranged upon bothfaces of the core, as set forth.

5. A die for the purpose described, consisting of a solid core carryingone-edged knives adjustably'secured upon its circumference in thedirection of the height of the core the cutting edges of said knivesreaching over the faces of the core, and marking-pins upon both faces ofthe core, as set fort 6. A die for the purpose described, consisting ofa solid core carrying one-edged knives adjustably secured upon itscircumference in the direction of the height of the core the cuttingedges of said knives reaching over the faces of the core, elastic rubberdisks and I marking-pins arranged upon both faces of the core, as setforth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRANZ MERTINZ.

Witnesses:

WENZEL RUDOLF SINKE, ALVESTO S. HocUE.

